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Finding the Fourth Proportional to 18,639.30, 27,957.94 and 5,491.79

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Solution

The fourth proportional to 18,639.30, 27,957.94 and 5,491.79 is: 8,237.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,639.30 : 27,957.94 = 5,491.79 : x
  2. Step 2: Convert to fraction form
    18,639.30/27,957.94 = 5,491.79/x
  3. Step 3: Cross multiply
    18,639.30x = 27,957.94 × 5,491.79
  4. Step 4: Simplify right side
    18,639.30x = 153,539,135.31
  5. Step 5: Solve for x
    x = 153,539,135.31/18,639.30
  6. Step 6: Final answer
    x = 8,237.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.